Cisco 24-Port Switch
Cisco CISCO1841 1841 Modular Router – 2x Fast Ethernet, 2 WAN Slots, 64MB Flash / 256MB DRAM
Cisco CISCO1841 1841 Modular Router
Cisco CISCO1841 1841 Modular Router is an enterprise-class modular router from the Cisco 1800 Series, designed for branch offices, small businesses, and professional WAN networking environments. It features two integrated 10/100 Fast Ethernet ports, two modular WAN interface slots, and one AIM slot, providing flexible connectivity and expansion options for routing, WAN access, and network services.
Description
The Cisco CISCO1841 is a modular Integrated Services Router from the Cisco 1800 Series, designed to provide reliable routing and network connectivity for branch offices, small and medium-sized businesses, and other professional networking environments.
The Cisco 1841 combines integrated Fast Ethernet connectivity with modular WAN expansion, allowing organizations to configure the router according to their specific network requirements. Cisco documentation identifies the platform as having two integrated 10/100BASE-T Ethernet ports, two WIC/HWIC-capable slots, and one Advanced Integration Module (AIM) slot.
Key Features
- Cisco 1841 Modular Router
- Cisco 1800 Series platform
- 2 integrated 10/100 Fast Ethernet ports
- 2 modular WAN interface slots
- 1 AIM slot for supported advanced integration modules
- Supports WIC/HWIC expansion
- Designed for branch-office and small-business networks
- Flexible WAN connectivity through optional interface modules
- Supports Cisco IOS-based routing and network services
- Suitable for legacy and specialized WAN deployments
Modular WAN Architecture
One of the major advantages of the Cisco 1841 is its modular design. The router provides two WIC/HWIC slots, allowing compatible WAN interface cards to be installed according to the connectivity requirements of the deployment.
Cisco documentation confirms that the Cisco 1841 supports WIC/HWIC modules in Slot 0 and Slot 1. Cisco also documents support for Fast Ethernet HWIC options on the 1841 platform.
This modular architecture makes the CISCO1841 useful in environments where different WAN technologies or interfaces may be required.
Integrated Fast Ethernet Ports
The router includes two integrated 10/100BASE-T Fast Ethernet ports, providing Ethernet connectivity for LAN and WAN networking applications.
These ports can be used to connect the router to:
- LAN switches
- Desktop and office networks
- Upstream network infrastructure
- WAN Ethernet services
- Other routing and networking equipment
Expansion Capability
The two modular slots provide flexibility for adding compatible Cisco interface cards.
Depending on the installed module, the router can be configured for different WAN technologies and interfaces. This makes the Cisco 1841 particularly useful for organizations maintaining existing Cisco-based infrastructure or specialized legacy WAN environments.
Advanced Integration Module Slot
The Cisco 1841 includes one AIM slot for supported Advanced Integration Modules.
This architecture allows supported additional functionality to be integrated into the router while keeping the primary chassis compact.
Memory Configuration
The base CISCO1841 configuration was originally specified with 32 MB of Flash memory and 128 MB of DRAM. Cisco also offered 1841 configurations and bundles with 64 MB CompactFlash and 256 MB DRAM, including security-oriented variants.
For this reason, the actual memory configuration should be verified against the physical unit being sold.
Important: If your specific unit is advertised as 64 MB Flash / 256 MB DRAM, that configuration should be stated separately from the standard base CISCO1841 specification.
Network Applications
The Cisco 1841 can be used for a variety of professional networking applications, including:
Branch Office Routing
Provides routing and WAN connectivity for branch-office networks.
Small Business Networking
Provides a modular routing platform for organizations requiring configurable WAN interfaces.
WAN Connectivity
Supports compatible WAN interface cards for different connectivity requirements.
Legacy Network Infrastructure
Its modular architecture makes it useful for maintaining and replacing equipment in existing Cisco 1800 Series deployments.
Training and Network Labs
The CISCO1841 can also be useful in educational environments and networking labs for studying Cisco IOS routing, WAN technologies, and modular network architecture.
Cisco IOS Platform
The Cisco 1841 operates as a Cisco IOS-based router, providing the software platform for routing and network services supported by the installed IOS release and hardware configuration.
Available capabilities depend on the installed IOS image, license, interface modules, and hardware configuration.
Important Expansion Considerations
The Cisco 1841 is a modular router, meaning that its capabilities depend partly on the interface cards installed in the two WAN slots.
The chassis itself should therefore be considered the core routing platform, while specific WAN technologies may require separately installed WIC/HWIC modules.
Cisco confirms that the WIC/HWIC/VWIC slots on the 1841 can accommodate compatible interface cards, while also noting that these slots do not provide Cisco inline power or Power over Ethernet.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Cisco |
| Series | Cisco 1800 Series |
| Model | CISCO1841 |
| Product Type | Modular Integrated Services Router |
| Integrated Ethernet | 2 × 10/100BASE-T Fast Ethernet |
| WAN Slots | 2 × WIC/HWIC slots |
| AIM Slot | 1 |
| WAN Expansion | WIC/HWIC compatible |
| Flash Memory | 32 MB on base configuration; configurations with 64 MB also available |
| DRAM | 128 MB on base configuration; configurations with 256 MB also available |
| Management | Cisco IOS |
| Primary Application | Branch/WAN Routing |
| PoE | Not supported through WIC/HWIC slots |
| Deployment | Branch Office / SMB / Network Lab |
Cisco documentation identifies the base CISCO1841 with two integrated Fast Ethernet ports, two WAN slots, IP Base, 32 MB Flash, and 128 MB DRAM; Cisco also offered 64 MB/256 MB configurations and bundles.
Connectivity and Expansion
The router’s modular architecture provides a useful balance between integrated Ethernet connectivity and WAN expansion.
The two integrated Fast Ethernet interfaces can provide local Ethernet connectivity, while the two WAN slots can be populated with compatible interface cards to meet specific WAN requirements.
This makes the CISCO1841 a flexible option for organizations operating or maintaining Cisco 1800 Series network environments.
Ideal Applications
The Cisco 1841 is suitable for:
- Branch-office networks
- Small business networks
- WAN routing
- Legacy Cisco network infrastructure
- Network training laboratories
- Cisco IOS practice environments
- Specialized WAN deployments
- Replacement of compatible Cisco 1800 Series routers
Product Benefits
Modular Design: Two WAN interface slots allow the router to be customized with compatible interface cards.
Integrated Ethernet: Two onboard Fast Ethernet ports provide convenient 10/100 network connectivity.
Expandable: Compatible WIC/HWIC modules can extend the router’s connectivity options.
Professional Platform: Designed as part of Cisco’s enterprise-oriented 1800 Series routing platform.
Flexible Deployment: Suitable for branch offices, small businesses, legacy infrastructure, and networking laboratories.
Product Summary
The Cisco CISCO1841 1841 Modular Router is a versatile Cisco 1800 Series routing platform featuring two integrated 10/100 Fast Ethernet ports, two modular WAN slots, and one AIM slot. Its modular architecture allows compatible WAN interface cards to be installed for specialized connectivity requirements.
The router is particularly suitable for organizations maintaining Cisco 1800 Series infrastructure, legacy WAN environments, branch-office networks, and networking laboratories.
Product Category: Networking → Routers → Modular Routers
Brand: Cisco
Series: Cisco 1800 Series
Model: CISCO1841
Product Type: Modular Router
Ethernet Ports: 2 × 10/100 Fast Ethernet
WAN Slots: 2
AIM Slot: 1
Memory: Configuration-dependent
Primary Use: WAN & Branch Routing
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